English verb conjugation
CAN TUN

Regular verb: tun - tuned - tuned

Affirmation

Simple form	V-ing form
I can tun you can tun he can tun we can tun you can tun they can tun	I can be tuning you can be tuning he can be tuning we can be tuning you can be tuning they can be tuning
Perfect	V-ing perfect
I can have tuned you can have tuned he can have tuned we can have tuned you can have tuned they can have tuned	I can have been tuning you can have been tuning he can have been tuning we can have been tuning you can have been tuning they can have been tuning

Negation

Simple form	V-ing form
I can't tun you can't tun he can't tun we can't tun you can't tun they can't tun	I can't be tuning you can't be tuning he can't be tuning we can't be tuning you can't be tuning they can't be tuning
Perfect	V-ing perfect
I can't have tuned you can't have tuned he can't have tuned we can't have tuned you can't have tuned they can't have tuned	I can't have been tuning you can't have been tuning he can't have been tuning we can't have been tuning you can't have been tuning they can't have been tuning

Interrogative form

Simple form	V-ing form
can I tun? can you tun? can he tun? can we tun? can you tun? can they tun?	can I be tuning? can you be tuning? can he be tuning? can we be tuning? can you be tuning? can they be tuning?
Perfect	V-ing perfect
can I have tuned? can you have tuned? can he have tuned? can we have tuned? can you have tuned? can they have tuned?	can I have been tuning? can you have been tuning? can he have been tuning? can we have been tuning? can you have been tuning? can they have been tuning?

Interro-negative form

Simple form	V-ing form
can't I tun? can't you tun? can't he tun? can't we tun? can't you tun? can't they tun?	can't I be tuning? can't you be tuning? can't he be tuning? can't we be tuning? can't you be tuning? can't they be tuning?
Perfect	V-ing perfect
can't I have tuned? can't you have tuned? can't he have tuned? can't we have tuned? can't you have tuned? can't they have tuned?	can't I have been tuning? can't you have been tuning? can't he have been tuning? can't we have been tuning? can't you have been tuning? can't they have been tuning?